[1]张志刚,赵林,张沛,等.亚高温下不同粉煤灰掺量高延性混凝土的力学性能[J].东南大学学报(自然科学版),2020,50(5):831-836.[doi:10.3969/j.issn.1001-0505.2020.05.006]
 Zhang Zhigang,Zhao Lin,et al.Mechanical properties of engineered cementitious composites with different fly ash contents at sub-elevated temperature[J].Journal of Southeast University (Natural Science Edition),2020,50(5):831-836.[doi:10.3969/j.issn.1001-0505.2020.05.006]
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亚高温下不同粉煤灰掺量高延性混凝土的力学性能()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第5期
页码:
831-836
栏目:
材料科学与工程
出版日期:
2020-09-20

文章信息/Info

Title:
Mechanical properties of engineered cementitious composites with different fly ash contents at sub-elevated temperature
作者:
张志刚12赵林2张沛2张仁毅2
1东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 210096; 2重庆大学山地城镇建设与新技术教育部重点实验室, 重庆 400045
Author(s):
Zhang Zhigang1 2 Zhao Lin2 Zhang Pei2 Zhang Renyi2
1Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China
2Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China
关键词:
高延性混凝土(ECC) 亚高温 粉煤灰 力学性能 聚乙烯醇(PVA)纤维
Keywords:
engineered cementitious composites(ECC) sub-elevated temperature fly ash mechanical properties polyvinyl alcohol(PVA)fiber
分类号:
TU528.58
DOI:
10.3969/j.issn.1001-0505.2020.05.006
摘要:
为了研究亚高温下粉煤灰掺量对高延性混凝土(ECC)力学性能的影响,对2组不同粉煤灰掺量的ECC试件进行了拉-压性能测试,并从微观尺度探究了亚高温下ECC力学性能的变化机理.试验结果表明,温度在20~200 ℃内时,2组不同粉煤灰掺量的ECC试件的抗压强度均随温度升高而增大,且在受拉时均表现出拉伸高延性.当温度为100和200 ℃时,粉煤灰掺量较低的ECC的初始开裂强度、最大拉伸强度与拉伸应变均出现明显劣化,而粉煤灰掺量较高的ECC则变化趋势相反.在微观尺度,200 ℃时PVA纤维自身的拉伸强度较20 ℃时降低了44%,导致纤维在粉煤灰掺量较低的ECC中易于被拔断.因此,高掺量粉煤灰有利于亚高温下ECC的拉伸力学性能.
Abstract:
To investigate the influence of fly ash contents on the mechanical properties of engineered cementitious composites(ECC)at the sub-elevated temperature, the tensile and compressive performance of two ECC mixtures with different fly ash contents were tested. The change mechanism of the mechanical performance of ECC at the sub-elevated temperature was also studied. The experimental results show that when the temperature is from 20 to 200 ℃, the compressive strength of the two ECC mixtures with different fly ash contents increases with the increase of the temperature, and both ECCs exhibit high tensile ductility. At 100 and 200 ℃, the first cracking strength, the tensile strength, and the strain capacity of ECC with lower fly ash content present a substantial deterioration, while those of ECC with higher fly ash content show the opposite change tendency. At the micro-scale level, the tensile strength of polyvinyl alcohol(PVA)fiber is reduced by 44% at 200 ℃ compared with that at 20 ℃, making PVA fibers easily be ruptured in ECC with lower fly ash content. Therefore, the high fly ash content is favorable to the tensile performance of ECC at the sub-elevated temperature.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2020-03-04.
作者简介: 张志刚(1982—),男,博士,讲师,博士生导师,zhangzg@cqu.edu.cn.
基金项目: 国家自然科学基金资助项目(51708061)、东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题资助项目(CPCSME2017-09).
引用本文: 张志刚,赵林,张沛,等.亚高温下不同粉煤灰掺量高延性混凝土的力学性能[J].东南大学学报(自然科学版),2020,50(5):831-836. DOI:10.3969/j.issn.1001-0505.2020.05.006.
更新日期/Last Update: 2020-09-20